Can you get pregnant from precum?

Patient: Dear Docter, me and my girlfriend had sex for the first time, we had unprotected sex but i didn’t ejaculate inside of her, so i wasn’t worried but the next day i was fingering her and then i noticed a sperm like substance oozing from her vagina, i was worried so i tasted it and it tasted like sperm from my experience, because i really don’t think that was from her, i am under 18 and im getting her a pill if i can get one from a chemist, but if i can’t il be so scared, what are the chances of s girl getting pregnant from precum? i really need to know quick, any response would be greatly appreciated, thank’s